Linear simulation of magnetohydrodynamic plasma response to three-dimensional magnetic perturbations in high-βP plasmas

Chen, Ran; Lyons, Brendan C.; Weisberg, David B.; Lao, L. L.; Ding, Siye; Sun, Y.; Garofalo, Andrea M.; Gong, Xianzu; Xu, Guo Sheng

doi:10.1088/1741-4326/ac39f4

Title: Linear simulation of magnetohydrodynamic plasma response to three-dimensional magnetic perturbations in high-β_P plasmas

Journal Article · Fri Mar 25 00:00:00 EDT 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac39f4· OSTI ID:1836558

Chen, Ran ^[1];

^[2];

^[2]; Lao, L. L. ^[2];

^[3]; Sun, Y. ^[1];

^[2]; Gong, Xianzu ^[1];

^[1]

Chinese Academy of Sciences (CAS), Hefei (China)
General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences (CAS), Hefei (China); Oak Ridge Associated Univ., Oak Ridge, TN (United States)

In this work, we report the numerical analyses of linear magnetohydrodynamics (MHD) plasma response to applied three-dimensional magnetic perturbations (MPs) in a joint DIII-D/EAST collaboration on high-β_P (poloidal beta) plasmas, utilizing the extended-MHD code M3D-C1, with the purpose of realizing a better understanding of the existing experiment in which the n=3 MPs were applied to such high-β_P plasmas attempting to control large amplitude type-I ELMs. Such high-β_P plasmas obtained at the DIII-D tokamak feature an upper-biased double null configuration, a high edge safety factor q₉₅~6.4, and a stable internal transport barrier (ITB) leading to relatively high core pressures. Single-fluid simulations show that the plasma response to n=3 MPs, including both non-resonant/kinking and resonant components, is significantly weaker than that to n=1 or 2 MPs. To survey the impact of q₉₅ on plasma response to applied MPs, the SEGWAY (Self-consistent Equilibrium Generating Workflow for AnalYsis) module, developed in the OMFIT integrated modelling framework, is employed to generate a series of equilibria with a wide range of q₉₅ while other key parameters including the normalized beta, electron density at pedestal top, and plasma shape are kept fixed. Compared to the vacuum response, single-fluid M3D-C1 simulations predict a much more significant decrease of resonant plasma response to the applied n=3 MPs at the maximum penetration radii as q₉₅ increases. In contrast to single-fluid simulation results showing resonant penetration occurs only near the pedestal top where the E×B toroidal rotation frequency is zero, two-fluid simulations show two comparable resonant penetrations locating near the pedestal top and the ITB foot, where the perpendicular electron rotation frequency is zero. Such resonant field penetration near the ITB foot may be responsible for the observed formation of a staircase structure in both electron density and temperature profiles and thereby a considerable deterioration of global plasma performance when MPs are applied in high-β_P plasmas. Motivated by this numerical work, we provide some ideas for the future research, with the purpose of realizing effective ELM control in such high-β_P plasmas on the DIII-D and EAST devices.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: FC02-04ER54698; FG02-95ER54309; 2017YFE0300400; 11675220; 11775264

OSTI ID:: 1836558

Journal Information:: Nuclear Fusion, Vol. 62, Issue 3; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Linear simulation of magnetohydrodynamic plasma response to three-dimensional magnetic perturbations in high-β_P plasmas